Propeller-wheel



UNirn STATES THOMAS TRIPP, OF CHICAGO, ILLINOIS.

PROPELLER-WHEEL.

Specification forming part of Letters Patent No. 53,902, dated April 10, 1866.

To ZZ whom it may concern:

Be it known that I, THOMAS TRIPP, of the city of Chica-go, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Propeller-IV heels 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and the letters and gures marked thereon, which form part of this specification.

The nature of my said invention consists in so projecting and constructing the blade of a propeller-screw that the water cannot glide oft' therefrom tangentially or parallel to their propelling-surfaces, the peculiar curvature and confirmation of the iiukes preventing and rendering their pressure against the water continuous until it passes out and escapes at the tail of the wheel.

To enable those skilled in the art to understand how to construct and use my invention, I will proceed to describe the same with particularity, making reference in so doing to the aforesaid drawings, in which- Figure l represents an end view. of my invention. Fig. 2 represents a side elevation of Vthe same. Fig. 3 is a plan view of a transverse section, representing one of the series of layers composing the wheel, and Fig. 4 is an edgewise view of one of the blades.

Similar letters of reference in the di'erent figures denote corresponding parts of my invention.

As the propeller-wheel is designed to be of east-iron, the subjoined description has more particular reference to the mode of constructing the pattern for forming the mold in which the wheel is cast.

A A A represent the three blades of the wheel,which, however, maybe of any other suitable number, the whole wheel bein g laid up in a succession of layers, as indicated by the letters a bc Z cf g i ij It, whose configuration, re

y spectively, is determined by the peculiar curvatures hereinafter described and illustrated in Fig. 3, while the configuration and form of the blades is determined by the gradual and uniform recession or laying off of the consecutive layers, as shown in Fig. 4, and hereinafter described. After all the layers are all arranged, the three at the front and rear ends of the wheel may be out down, as shown, so

as to renderthe hub of the wheel of a suitable length, while the extreme layers, a b c and j 7c, add greatly to the power of the wheel; or, if preferred, the said layers last mentioned may be cut to the proper shape and length before being attached to the wheel.

To lay up and construct the pattern of my improved wheel I proceed as follows, making reference to Fig. 3: From a center, Z, which corresponds to the center of the wheel, I describe the circumference, a, which is to circumscribe the outer dimensions ot' the wheel. lVith a radius equal to three-eighths of the radius of the circle n, and from the same center Z, I then describe the circle m. The line Z o is then drawn, and taking o s, equal to xx, in Fig. 4, the distance which each succeedin g layer is laid back in giving the desired inclination to the iiukes, the line Zs is drawn with a radius equal to Z m. I then und a center from which a circumference may be drawn, cutting the circumferences m u at the points of intersection with the lineZ o. From the center Z, I then describe a circumference which passes through the center last found. (Marked q.) Takin g m r, equal to three-eighths of o q, the circumference r is drawn, and with a radius, Z r, I find a center from which a eircumference may be drawn, cutting the circumference m at its intersection with Z o and passing through the center Z, said are m p Z being drawn in the reverse direction from the arc o p m, previously described. rIhe line 0 p m p Z determines the form and conguration of the first layer, h. The end vie-w of the sections, as they are laid up, being indicated by the dotted lines in Fig. 4. Takingo s, equal to the distance for laying off each successive layer, the line Z s is drawn, and with the same radii the arcs s t m and m t Zare drawn as before, the curved line s t m t Z determining the face and configuration of the layer g, and so on unt-il the whole islaid up.

The relative lengths of the radii Z m and Z o may be varied from the proportions before stated, and the angle of inclinatiomas seen in Fig. 4, may also be varied, if desired. The opposite sides of the blades are out down so as to lie parallel to the faces determined as aforesaid, as indicated by the full inclined lines in Fig. et.

The main point in my invention consists in having the outer curve of the blades coincide with an are of' the circumference n circumscribing the Wheel, While the inner curve of said blades lying,` in the reverse direction coincides with en arc drawn upon u, radius equal to ehehe-lf the radius oi' said outer circle, n.

What; I claim as my invention, sind desire to secure by Letters Patex1t,is-

Gonstructing the blades of a propelerscrew with two reversed curves, which shall be arcs of the two circles last-above described, as and for the purposes specied and shown.

THOMAS TRIPP.

Witnesses:

W. E. MARES, GEO. B. NICHOLS. 

